A : The first phase of ventricular filling is | vedclass

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(C) The first phase of ventricular filling is rapid due to the opening of the $AV$ (atrioventricular) valves,which allows blood to flow passively from

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Assertion is correct,but Reason is incorrect.

Vedclass · Answer

(C) The first phase of ventricular filling is rapid due to the opening of the $AV$ (atrioventricular) valves,which allows blood to flow passively from the atria into the ventricles. This rapid inflow causes the $3^{rd}$ heart sound. Auricular systole (atrial contraction) occurs later and contributes to the final phase of ventricular filling,not the rapid initial phase. Therefore,the Assertion is correct,but the Reason is incorrect.

$A$ : The first phase of ventricular filling is rapid and causes the $3^{rd}$ heart sound.
$R$ : It is because of auricular systole.

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$A$ : The first phase of ventricular filling is rapid and causes the $3^{rd}$ heart sound.$R$ : It is because of auricular systole.